<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <h3>{{msg}}</h3>
        <button @click="fn1">反转世界</button>
    </div>
    <script src="./vue.js"></script>
    <script>
        new Vue({
            el: "#app",
            data() {
                return {
                    msg: "hello world",
                }
            },
            methods: {
                fn1() {
                    // const arr = this.msg.split('')
                    // this.msg = arr.reverse().join('')

                    //简写
                    //.split('')转换成数组 以空为隔断 所以每个字母都是一个数组
                    //reverse()数组反转   只有数组可以用所以要先改为数组
                    //join('')在转会为字符串
                    this.msg = this.msg.split('').reverse().join('')
                }
            }
        })
    </script>
</body>

</html>